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外科手術侵襲に対し耐容力が低く,かつ高度硬化性弁病変を有する僧帽弁狭窄症に対するPTMCの安全性,有用性を評価するため,心臓超音波法で高度病変(エコースコア10以上)が確認された僧帽弁狭窄症16例(年齢42〜76歳,男性9例,女性7例)にPTMCを施行した.弁口面積は平均0.7±0.2から1.2±0.2(cm2)へ有意(p<0.01)に増加した.心臓カテーテル時の血行動態計測では,左房圧は,平均24.5±7.6から14.6±6.8(mmHg)へ有意に(p<0.01)減少し,心拍出量は平均3.6±0.9から4.1±1.0(l/min)へ有意(p<0.01)に増加した.NYHA機能分類では16例中12例で改善が認められ,4例は不変であった.PTMCの技術的成功率は100%であった.3例に左房内血栓が確認されたが,全例PTMCによる塞栓症の合併,重症僧帽弁逆流発生は認められなかった.PTMCは高度硬化性弁病変を有する僧帽弁狭窄症例に対しても,安全でかつ有用な治療法であると考えられた.
To evaluate the effectiveness and safety of per-cutaneous transvenous mitral commissurotomy (PTMC) for mitral stenosis patients with surgical high risk and severe valve deformity, we performed PTMC in 16 severe mitral stenosis patients with an echo score of≧10.
There were 9 men and 7 women, aged 42 to 76 years. After PTMC, the mitral valve area significantly in-creased from the mean 0.7±0.2 to 1.2±0.2(cm2). As a result of the increase in the valve area, left atrial pressure significantly decreased from the mean 24.5± 7.6 to 14.6±6.8 (mmHg), and cardiac output significant-ly increased from the mean 3.6±0.9 to 4.1±1.0 (l/min). In the NYHA functional class, 12 of 16 patients showed symptomatic improvement and 4 patients showed no symptomatic worsening.
The technical success rate of PTIVIC was 100%. In this study, PTMC was able to be performed without embolic complications in 3 patients with thrombi in the left atrium documented by transesophageal echocardio-graphy. Following PTMC, there was no marked increase in the degree of mitral regurgitation. This study has demonstrated that PTMC can be performed safely and is of clinical use even in treating mitral stenosis patients with severe valve deformity.
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